The article compares the technologically recoverable reserves of shale gas as an unconventional resource of hydrocarbon raw materials in various countries of the world. An assessment is made of the use of horizontal well drilling in combination with hydraulic fracturing of the formation during shale gas production, characterized by the level of technology that allows the most efficient extraction of this resource in the US, Canada, China and Argentina. The article outlines perspectives for the development of shale gas in the near and distant future and shows the obstacles to the development of the oil shale industry in some countries. The basic geo-ecological problems in the development of shale gas: the contamination of surface water and soil, groundwater pollution, gas emissions, seismic risks. The ways of solving these problems are primarily through the use of new field development technologies, the implementation of integrated monitoring safety equipment, taking into account local and regional conditions and the condition of the geological environment.
The paper reposts on a comprehensive study of Carbon Dioxide Enhanced Oil Recovery (CO2-EOR), a detailed literature and projects review. In one hand, according to past studies, when injected CO2 and residual oil are miscible (Miscible Displacement), the physical forces holding the two phases apart (Interfacial Tension, IFT) disappears; as CO2 dissolves in the oil, it swells the oil, reducing its viscosity and density. This allows the oil CO2 to displace the oil from the rock pores, pushing it towards a production well. On the other hand, when injected CO2 and residual oil are not miscible (Immiscible Displacement), this process is used as a secondary recovery method. As many experts look to carbon capture, utilization and storage (CCUS) as one of the best alternatives for dealing with carbon emissions, research studies and laboratory investigations have indicated that, beyond its potential to augment oil production, CO2-EOR is getting intensive scrutiny by the industry, government, and environmental organizations for its potential for permanently storing CO2. A good example is a study by Montana Tech University, which found that CO2 flooding of Montana�s Elm Coulee and Cedar Creek oil fields could result in the recovery of 666 million barrels of incremental oil and the storage of 640 billion cubic meters of CO2, which is equivalent to 7 years of supplier�s CO2 emissions (a coal-fired power plant). Some other projects in the U.S., Canada and Norway have been evaluated. An economic and ecological analysis of the CO2-EOR process have been provided.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.